Tab + X Full-screen view won't stay since recent update

Briefly describe (1-2 sentences) the Bug you’re experiencing: While working in task full-sreen mode, going into and out of subtasks removes full-screen mode entirely, making for a detrimental UX while tasking up work. See screencast for example:

Steps to reproduce: see screencast

Browser version: Version 83.0.4103.116

Upload screenshots below:

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