Trace disappears except when layers menu panel open. Android9 Chrome 121.0.6167.101

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Sometimes I use Brouter in a Samsung tablet Android9 Chrome 121.0.6167.101.

| can create routes OK. but the route created is only visible when the Layers menu panel at right is open for example to choose different map. Opening and closing that panel make the route visible or not. Start, waypoint, and end markers are always visible. It is only the route itself, whether purple or coloured for route quality, that disappears

Most of my devices are on Chrome 120 and seem to function correctly . Why this one is on Chrome 121 I do not know.

Using Samsung Internet on the same device all seems normal.

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With a Chromebook on Version 121.0.6167.85 (Official Build) lacros (64-bit) all seems OK