VNAV Bug on climb (MCP ALT CHANGE)

[AleckOnTech]

X-Plane Version: XP11.55
Cruising Altitude: 30,000 feet
Initial Climb: 7000 feet

Bug Description:
I was on VATSIM and my initial climb was 7000 feet using VNAV Climb not FLCH, ATC instructed me to climb to FL200 (20,000 feet). I entered the MCP ALT to 20000 feet. When I reached 7000 feet, VNAV held the altitude to 7000 not continuing to 20000 feet. When this happened, I tried to push the mcp alt knob (ALT INTV) but nothing happened. My FMA flickers on (SPD and THR REF) and (VNAV SPD and VNAV PATH) so I used FLCH to climb to 20,000 feet and continued to cruise

The video of the bug was a step climb on FL300 to FL320. This may be related to the bug on what I specify at top and what on the video.
https://drive.google.com/file/d/1zNx6gkZII93Hc-dSTy0nRV3vipxQvynJ/view?usp=sharing

Please provide documentation references:

Place an x to check the boxes:

• Something found during a flight test
• FCOM reference included (issues are likely to be closed without this)
• checked current FMC revision ident
• Video included (where applicable)
• Screenshot included (where applicable)

Bug reports:

Many remaining issues are likely airframe specific, please provide the livery this bug happens with

Airframe: ________

The livery folder will also contain a jdat file of various data recorded during the flight, please attach it to the report if the issue occurs during a specific phase of flight

Please replace this line with a detailed description of the issue

[AleckOnTech]

Update: Affected at XP12 at Version 3.4