OpenTopoMap not displayed on mobile device

The same situation occurs on another D11.1.0 instance: the OpenTopoMap tiles are not displayed on a mobile device nor on an emulated mobile device.

Hello,
Thank you @gillesbailleux for your report.
Yes you are right opentopomap doesn't support tiles with this form $zxy = '{z}/{x}/{y}{r}.png';
By checking the official website opentopomap https://opentopomap.org/#map=5/49.023/10.020 now they are using simple form $simple_zxy = '{z}/{x}/{y}.png';

I will commit the fix it will be part of the next release.

Result after the fix!

Greetings @berramou,

Thank you very much for taking care of this bug report and also for fixing it in the next release.

In the meantime, I modified line 522 of the leaflet_more_maps.module file and I confirm the bug is fixed.

I am fond of this map provider and your help is more than welcome.