[Bug]Trim the polysurface in Rhino7 SR9

录制_2021_09_02_10_32_25_921
The polysurface will be selected automaticly when I trim it. but the surface is fine.

Hello - yes, that is this bug -
RH-65316 Trim: Object being cut remained selected

it has been fixed - it looks like the fix is in 7.10. This is available if you set Options > Updates and Statistics page > Update frequency to ‘Service release candidate’.

-Pascal

Great thanks.