[Maps] Map layer "Thunderforest OpenCycleMap" stopped working (and problems with other layers)

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Describe the bug

When I select this layer, nothing happens, I only see the GC.com default map.

To Reproduce

See above.

Expected behavior

No response

OS

Windows

Browser

Firefox

GClh Version

0.15.8

Additional context

OpenCycleMap, tile-hosted by Thunderforest, is included as an official map layer on openstreetmap.org and works without issues.