As a workaround, you can break highlighting on the holding clip clickspot. Inside your community folder, find the file justflight-aircraft-146\SimObjects\Airplanes\JF_146_100\model\JF_146_100_VC.xml.
Make a backup copy of that file!
Towards the end, starting from line 21447, you should have the "Paper" section. Inside that, you have two sections with the IDs Paper_checklist_clip_L and Paper_checklist_clip_R. In each of those, add a non-existing highlight node like this:
<Component ID="Paper_checklist_clip_L" Node="Paper_checklist_clip_L">
<UseTemplate Name="ASOBO_GT_MouseRect">
<Cursor>Hand</Cursor>
<!-- add this --> <HIGHLIGHT_NODE_ID>SOMETHING_IN_SPAAAACE</HIGHLIGHT_NODE_ID>
<MOUSEFLAGS_DEFAULT_IM>LeftSingle</MOUSEFLAGS_DEFAULT_IM>
<CALLBACKCODE_DEFAULT_IM>
(L:Paper_checklist_vis_L, bool) ! (>L:Paper_checklist_vis_L, bool)
</CALLBACKCODE_DEFAULT_IM>
<TOOLTIPID>Toggle Checklist Visibility</TOOLTIPID>
</UseTemplate>
</Component>
As a result, the clipboard will no longer highlight when you hover over the clip, and that appears what breaks the texturing. As for a fix, maybe make only the clip itself addressable as a node here to avoid blinking the entire surface.