Rebased. Also, separate thread with some additional explanation is here:
https://www.postgresql.org/message-id/flat/cadzflwxzvmbo11tfs_g2i+6tffvwhu4vuuseoqb+8uqfuoj...@mail.gmail.com
v12-0002-Fix-logical-replication-conflict-detection-durin.patch
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v12-0001-This-patch-introduces-new-injection-points-and-T.patch
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