heater error/printer halt after M600 bugfix 2.0.x

[phongshader]

Bug Description

heater halts after M600

Configuration Files

Marlin bugfix 2.0.x 12/03/2020
bttgtr_conf.zip

Steps to Reproduce

1. have filament sensor trigger/run M600
2. load filament
3. heater fault/printer halt when trying to get hot end back up to temp

Expected behavior:
hot end gets up to temp and resumes print

Actual behavior:
printer halts on heater error

Additional Information

this is the heater graph after M600:

this is lowering the temp from 220 to 190, this halts the printer too.

I changed these settings in configuration_adv:
#define WATCH_TEMP_PERIOD 40 // Seconds changed to 40 from 20 still halted
#define WATCH_TEMP_INCREASE 2

#if ENABLED(THERMAL_PROTECTION_HOTENDS)
#define THERMAL_PROTECTION_PERIOD 60 // Seconds changed from 20 to 60 still halted
#define THERMAL_PROTECTION_HYSTERESIS 4

At first I thought this was a hardware issue. I changed the heater cartridge, thermistor, eventually, motherboard (for reasons unrelated to this issue). Here is the support thread with the motherboard maker makerbase-mks/MKS-RUMBA32#26 I have switched to a BTT GTR board and the problem persists.

[phongshader]

I disabled thermal runaway protection and the M600 ran as expected. I used a stopwatch to measure the time it took the HE to get to temp and it was 80 sec. I increased both #define WATCH_TEMP_PERIOD and #define THERMAL_PROTECTION_PERIOD 60 to 80then re-enabled thermal runaway protection and that seemed to fix the issue. Is it ok/safe to increase these times to that level?

[github-actions]

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