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Fix crash on save-branch-as-scene

Rafał Mikrut requested to merge github/fork/RandomShaper/fix-crash-save-branch into master

Created by: RandomShaper

Fixes #15539 (closed). Fixes #9367 (closed).

These reports were made for 2.1, because original reporters weren't able to reproduce it on 3.0.

The truth is that given that 3.0 performs no byte-tagging on released memory, accessing a dangling object can be unnoticed. In this case. the crashing code would get the illusion that the signal map was just empty but valid, albeit actually the whole object had been released.

@reduz, maybe you can change your mind about byte-tagging on memory release for debug builds.

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