Double prompt for IFR FP open

Do you have any add-ons in your Community folder? If yes, please remove and retest before posting.
I do, but they don’t touch ATC in any way.

Are you using Developer Mode or made changes in it?
No, no.

Brief description of the issue:
Duplicate prompt to open IFR flight plan; strange ATC behavior after.

Provide Screenshot(s)/video(s) of the issue encountered:
n/a

Detail steps to reproduce the issue encountered:
IFR Bielefeld (EDLI) to Merzbruck (EDKA).pln (2.6 KB)

IFR flight from EDLI circa 12:00 Zulu, DA62. T/o RW 11. Significant deviation from FPL, asked for vectors to next WP from something Center. Was vectored to EDKA (?) instead – at least in that direction. AP HDG mode. CDI GPS. Changed CRS to DCT EDKA. Opened ATC menu – among usual prompts an option to open IFR flight plan. Later asked for FL decrease, approved. Since then ATC seemed to forget about me at all (no reasonable vectors to visual RW 26), although still operational, heard communications, and was approved to change to VFR after I got desperate.

Build Version # when you first started experiencing this issue:
1.15.10.0

Are you on the Steam or Microsoft Store version?
Steam

Did you submit this to Zendesk? If so, what is your ticket #?
No