When a plugin includes a migration to add a core block, and that block get's "chopped" with a new obsidian block, the plugin's migration will fail to run (it gets an exception for missing block guid). This requires plugin developers to release a new version of their plugin anytime a new version of Rock is released. This especially affects a theme plugin that has migration to add a lot of public pages using a lot of core blocks. 

wouldn't it be an easy update to the AddBlock() migration helper method to add try/catch and if an exception occurs, check the block guid against a dictionary of chopped blocks. 

For example:

try

{

    ...[existing logic]

}

catch (Exception ex)

{

    var blockReplacements = new Dictionary<string, string> {

        // blocks chopped in v18.0.13

        { "476FBA19-005C-4FF4-996B-CA1B165E5BC8", "FF88B243-4580-4BE0-97B1-BA9895C3FB8F" }, // Email Preference Entry ( Communication )

        { "13165D92-9CCD-4071-8484-3956169CB640", "535500a7-967f-4da3-8fca-cb844203cb3d" }, // File Asset Manager

        { "CABD2BFB-DFFF-42CD-BF1A-14F3BEE583DD", "0252E237-0684-4426-9E5C-D454A13E152A" }, // Registration Entry

        // blocks chopped in v18.0.11

        { "0926B82C-CBA2-4943-962E-F788C8A80037", "000ca534-6164-485e-b405-ba0fa6ae92f9" }, // Binary File Type List ( Core )

        { "508DA252-F94C-4641-8579-458D8FCE14B2", "b52e7cae-c5cc-41cb-a5ec-1cf027074a2c" }, // Metric Value Detail ( Reporting )

        { "56ABBD0F-8F62-4094-88B3-161E71F21419", "c3544f53-8e2d-43d6-b165-8fefc541a4eb" }, // Communication List ( Communication )

        { "ACF84335-34A1-4DD6-B242-20119B8D0967", "6bc7da76-1a19-4685-b50a-dfd7eaa5ce33" }, // Schedule Category Exclusion List ( Core )

        { "C7FCE3B7-704B-43C0-AF96-5A70EB7F70D9", "35D5EF65-0B0D-4E99-82B5-3F5FC2E0344F" }, // Connection Opportunity Signup ( Connection )

        { "CEDC742C-0AB3-487D-ABC2-77A0A443AEBF", "2B63C6ED-20D5-467E-9A6A-C608E1D953E5" }, // Communication Detail ( Communication )

        { "D9302E4A-C498-4CD7-8D3B-0E9DA9802DD5", "66f5882f-163c-4616-9b39-2f063611db22" }, // Bulk Import ( Bulk Import )

        { "DA102F02-6DBB-42E6-BFEE-360E137B1411", "740f7de3-d5f5-4eeb-beee-99c3bfb23b52" }, // Merge Template List ( Core )

        { "DF0F5743-2BFF-40C0-8BEE-39F1DE7B4C22", "3f997da7-ac42-41c9-97f1-2069bb9d9e5c" }, // Prayer Comment List ( Core )

        // blocks chopped in v18.0.10

        { "3131C55A-8753-435F-85F3-DF777EFBD1C8", "8adb5c0d-9a4f-4396-ab0f-deb552c094e1" }, // Benevolence Request List ( Finance )

        { "41AE0574-BE1E-4656-B45D-2CB734D1BE30", "6e9672e6-ee42-4aac-b0a9-b041c3b8368c" }, // Nameless Person List ( CRM )

        { "63ADDB5A-75D6-4E86-A031-98B3451C49A3", "6c824483-6624-460b-9dd8-e127b25ca65d" }, // Web Farm Node Log List ( WebFarm )

        { "78A31D91-61F6-42C3-BB7D-676EDC72F35F", "1c3d7f3d-e8c7-4f27-871c-7ec20483b416" }, // Block Type List ( CMS )

        { "7F9CEA6F-DCE5-4F60-A551-924965289F1D", "6554ADE3-2FC8-482B-BA63-2C3EABC11D32" }, // Group Schedule Toolbox ( Group Scheduling )

        { "95F38562-6CEF-4798-8A4F-05EBCDFB07E0", "6bba1fc0-ac56-4e58-9e99-eb20da7aa415" }, // Web Farm Node Detail ( WebFarm )

        { "A3E648CC-0F19-455F-AF1D-B70A8205802D", "6c329001-9c04-4090-bed0-12e3f6b88fb6" }, // Block Type Detail ( CMS )

        { "C4191011-0391-43DF-9A9D-BE4987C679A4", "e1dce349-2f5b-46ed-9f3d-8812af857f69" }, // Bank Account List ( Finance )

        { "C93D614A-6EBC-49A1-A80D-F3677D2B86A0", "52df00e5-bc19-43f2-8533-a386db53c74f" }, // Campus List ( Core )

        { "CE9F1E41-33E6-4FED-AA08-BD9DCA061498", "e20b2fe2-2708-4e9a-b9fb-b370e8b0e702" }, // Saved Account List ( Finance )

            // blocks chopped in v18.0.8

        { "250FF1C3-B2AE-4AFD-BEFA-29C45BEB30D2", "770d3039-3f07-4d6f-a64e-c164acce93e1" }, // Signal Type List ( Core )

        { "B3F280BD-13F4-4195-A68A-AC4A64F574A5", "633a75a7-7186-4cfd-ab80-6f2237f0bdd8" }, // AI Provider List ( Core )

        { "88820905-1B5A-4B82-8E56-F9A0736A0E98", "13f49f94-d9bc-434a-bb20-a6ba87bbe81f" }, // AI Provider Detail ( Core )

        { "D3B7C96B-DF1F-40AF-B09F-AB468E0E726D", "120552e2-5c36-4220-9a73-fbbbd75b0964" }, // Audit List ( Core )

            // blocks chopped in v18.0

        { "1D7B8095-9E5B-4A9A-A519-69E1746140DD", "e44cac85-346f-41a4-884b-a6fb5fc64de1" }, // Page Short Link Click List ( CMS )

        { "4C4A46CD-1622-4642-A655-11585C5D3D31", "eddfcaff-70aa-4791-b051-6567b37518c4" }, // Achievement Type Detail ( Achievements )

        { "7E4663CD-2176-48D6-9CC2-2DBC9B880C23", "fbe75c18-7f71-4d23-a546-7a17cf944ba6" }, // Achievement Attempt Detail ( Engagement )

        { "9C1236AE-4FF0-480C-A7DF-0E5277CA75FB", "b294c1b9-8368-422c-8054-9672c7f41477" }, // Achievement Attempt List ( Achievements )

        { "C26C7979-81C1-4A20-A167-35415CD7FED3", "09FD3746-48D1-4B94-AAA9-6896443AA43E" }, // Lava Shortcode List ( CMS )

        { "D2F918CF-F63C-4643-A02A-FD3DE7C5CFFD", "4acfbf3f-3d49-4ae3-b468-529f79da9898" }, // Achievement Type List ( Streaks )

        { "D6D87CCC-DB6D-4138-A4B5-30F0707A5300", "d25ff675-07c8-4e2d-a3fa-38ba3468b4ae" }, // Page Short Link List ( CMS )

    };



    if (blockTypeGuid.HasValue && blockReplacements.ContainsKey( blockTypeGuid.Value.ToString().ToUpper() ))

    {

        blockTypeGuid = blockReplacements[blockTypeGuid.Value.ToString().ToUpper()].AsGuidOrNull();

        AddBlock( skipIfAlreadyExists, pageGuid, layoutGuid, siteGuid, blockTypeGuid, name, zone, preHtml, postHtml, order, guid );

    }

    else

    {

        throw ex;

    }

}