I have done several snaps and actually the one based on node-red is not working because of a bug in snapd 2.49.
fom permission point of view see: https://forum.snapcraft.io/t/snap-no-longer-has-write-permission/22686/3
the 2.5 version fix the problem. tested on core and core virtual.
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I encountered this problem while doing a node-red snap. I confirm that the problem is related to snapd 2.48-2.49. the version 2.5 solves the problem.