[QGIS-Developer] Old(ish) plugins not using QgsNetworkAccessManager crashing regularly

[Nils Nolde]

Hi,

just wanted to know if anyone experiences problems with QMS maps (and 
other plugins using deprecated network access managers, e.g. the new 
MapTiler plugin)?

Whenever I zoom in/out too fast (with mouse wheel) with e.g. CartoDB's 
Positron map or MapTiler's Basic map, QGIS gets stuck in the rendering 
loop and I have to force quit eventually. I skipped a few QGIS versions 
from 3.4 to 3.12 and <= 3.4 I never experienced anything like that.

If it's indeed an issue with network access methods, I wonder if there 
should be a broader notification to all plugin maintainers using 
deprecated ways to make network requests.

Cheers
Nils