the gif is made from a browser emulator screen recording, but I compared it with transition on a real device - the behavior is identical.
the gif is made with 5 PPS and low network connectivity to illustrate the issue clearer.

Steps to Reproduce:

As a newcomer assigned with variant C (or use the Console snippet) - log in on to mobile.
On the Homepage -click on SE card to go to 'Suggested edits' overlay. Click there on the info icon.

Transition to the first overlay - "About suggested edits" will be jerky:
- the display width gets narrower for a moment before returning to the normal width in a next overlay
- the title "About suggested edits" appears on the left side and then moves to accommodate 'X' icon
- when switching back from "About suggested edits" to SE card (clicking 'X') - the SE card is shifted (the same change in width as it was when clicking on the info icon).

Related Objects
Search...

Status	Subtype	Assigned	Task
Resolved		MMiller_WMF	T238887 [EPIC] Growth: Homepage variant tests
Resolved		RHo	T246533 Variant tests: "initiation part 2" test (C vs. D)
Declined	BUG REPORT	None	T265427 [mobile] variant C - make transition between overlays smoother

Event Timeline

Oh yeah, that's not great. @MMiller_WMF -can we squeeze this into the 'interlude' work?

@kostajh @Tgr @Catrope -- I'm interested if you can think of anything that can be done here. I'll also bring it up in our team meeting.

We have decided not to address this in the near term because the solution will not be simple.

This looks like a scrollbar issue to me. Given that neither screens actually scroll, it does seem like it could be tricky to hunt down.

Declining, but reopen if it's important :)