UI inconsistency when messages from before joining can't be decrypted

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Steps to reproduce

1. get invited into e2ee room that has some history
2. message visibility: everyone from the time of selecting this option
3. I can't believe that in my case none of the other clients would be element web i.e. able to share encryption keys for events from before my join

Outcome

What did you expect?

• if there are messages, show that they exist and explain the reason I can't decrypt them

What happened instead?

• room is blank apart from own join event
• that blankness is "too high", it lets a scrollbar appear: There seems to be an <ol class="mx_RoomView_MessageList" with an element.style style="height: 1200px;" for no reason since it's empty apart from the mentioned join event
• the room list does show that someone sent an event that can't be decrypted. so does android.

these are kinda all issues on their own to me.
related are #16983 element-hq/element-meta#647, but especially the "too big blank space" is what made me open this extra issue

Operating system

arch

Application version

Element Nightly version: 2021112401 Olm version: 3.2.3

How did you install the app?

aur

Homeserver

No response

Will you send logs?

No