track > sharing > image & stats: Sometimes some tiles not rendered

As I use v4.30.1.7beta since around 2 weeks, I have again access to share pic feature. Feedback: For some but not all tracks, until all tiles in the share pic have been rendered, I needed maybe a dozen tries.

Interestingly, a tile could be missing that has been redered in a previous try, i.e. nothing is cached. I have the impression the longer the route and the more complex the rendered map, the higher the probability of missing tiles.