I get the artifacts on the skymap also using both Remmina and TigerVNC.
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When using VNC over the Stellarmate Hotspot, the VNC connection eventually freezes up and the connection becomes unusable. This only happens with the Skymap over the Hotspot using any VNC program. .
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If I connect the Rpi to my home network or the mount's handset's router via WiFi or if I plug an ethernet cable directly into the Rpi, then it works normally - with the artifacts.
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If I can stay away from the Skymap and use only the Ekos and INDI driver pages, then the VNC connection over Hotspot works reasonably well. But once I go to the skymap then the Rpi side freezes and needs to be power cycled.
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I believe this freezing is happening to only the graphics system since ekos and INDI still operate the mount and cameras normally. I just cannot access any controls. I can still SSH normally into the Rpi and run command line tools such as htop.

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