It only seems to be with flowchart, all the other types are rendering correctly.
Trying to dig deeper, it doesnt seem to correlate to a specific version though... I went back as far as 8.6.4 and it didnt fix it and i'm sure it did work correctly before.
The only thing i can think of now, is that something changed with an update of the browsers? Windows itself? as it's globally on this system. More people should have this issue right?
Describe the bug
Flowchart shapes do not resize to the text correctly
Expected behavior
Text should be contained by the shapes.
Screenshots

Desktop (please complete the following information):
Yep. I'm seeing the same issue. In my case it seems to happen in Microsoft Edge (Chromium) but not in Google Chrome.
OS: Windows 10 Pro v 1909 (Build: 18363.1198)
MS Edge Chromium: Version 87.0.664.41 (Official build) (64-bit)
Google Chome: Version 86.0.4240.198 (Official Build) (64-bit)
MS Edge Chromium:

Google Chrome:

Hi Thanks for reporting! Could you please check your browsers zoom level.
No problem, in my case, zoom level is at 100% (default).
In the meantime, i did discover by accident that using flowchart instead of using graph does seem to fix it in our case.
That's probably using the new implementation? I remember something like a flowchart-v2 when i through the source code.
I don't know the exact reason.
I noted this problem after updating chrome or edge to version 87
no problem in version 86
Hi Thanks for reporting! Could you please check your browsers zoom level.
Thanks for responding!
I switched through various zoom levels (including at 100%) and it made no difference.
Hi, I am having the same issue using chrome Version 87.0.4280.66 (Official Build) (64-bit)
Changing the zoom level has no impact. However, I have found that the issue only occurs on high-resolution monitors.