Bug: Rhino7: when editing, hourglass appears-suddenly program crashes

Process: Rhinoceros [773]
Path: /Applications/Rhino 7.app/Contents/MacOS/Rhinoceros
Identifier: com.mcneel.rhinoceros.7
Version: 7.13 (7.13.21348.13002)
Code Type: X86-64 (Translated)
Parent Process: ??? [1]
Responsible: Rhinoceros [773]
User ID: 501

Date/Time: 2022-01-01 13:19:19.455 +0100
OS Version: macOS 11.5.2 (20G95)
Report Version: 12
Anonymous UUID: A77CB80F-3DCE-85A4-5910-52B5FF873677

Time Awake Since Boot: 750 seconds

System Integrity Protection: enabled

Crashed Thread: 0 tid_103 Dispatch queue: com.apple.main-thread

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY

If it were me, I’d update macOS.
11.6.2 is the current Big Sur version.
You are behind on updates.