If a second Advanced HTML block is in use, moving it up or down causes the content of the second block to be overwritten with the content of the first Advanced HTML block. This causes irretrievable loss of data unless a database backup or other copy of the content is available.
It might be easier to not duplicate content in new blocks. This feature is probably not expected, so its loss will be seldom missed, and it's easy enough to copy and paste if a duplication is desired. Multiple Advanced HTML blocks is probably a rarely used feature, but the consequences of this bug - data loss - may be severe.
I can follow up with a patch, but I'd like to know if removing the content duplication feature is acceptable.
I don't know if the HTML block or other blocks are also affected by this bug.
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