No longer getting M501 data

[Taomyn]

Just upgraded from the stock Creality 1.1.4 board running Marlin 2.0.3 to an SKR mini E3 running the new Marlin 2.0.4.1, OctoPrint is 1.4.0rc5, and now the plug-in no longer gets the data from M502. This is all the file I save contains:

Send: M504

Recv: echo:EEPROM OK
Recv: ok,Send: M501

Whereas the console shows:

Send: M504
Recv: echo:EEPROM OK
Recv: ok
Send: M501
Recv: echo:V76 stored settings retrieved (687 bytes; crc 29436)
Recv: echo:  G21    ; Units in mm (mm)
Recv: echo:  M149 C ; Units in Celsius
Recv: 
Recv: echo:; Filament settings: Disabled
Recv: echo:  M200 D1.75
Recv: echo:  M200 D0
Recv: echo:; Steps per unit:
Recv: echo: M92 X80.00 Y80.00 Z400.00 E143.00
Recv: echo:; Maximum feedrates (units/s):
Recv: echo:  M203 X500.00 Y500.00 Z20.00 E25.00
Recv: echo:; Maximum Acceleration (units/s2):
Recv: echo:  M201 X500.00 Y500.00 Z100.00 E5000.00
Recv: echo:; Acceleration (units/s2): P<print_accel> R<retract_accel> T<travel_accel>
Recv: echo:  M204 P500.00 R500.00 T500.00
Recv: echo:; Advanced: B<min_segment_time_us> S<min_feedrate> T<min_travel_feedrate> J<junc_dev>
Recv: echo:  M205 B20000.00 S0.00 T0.00 J0.08
Recv: echo:; Home offset:
Recv: echo:  M206 X0.00 Y0.00 Z0.00
Recv: echo:; Auto Bed Leveling:
Recv: echo:  M420 S0 Z0.00
Recv: echo:  G29 W I0 J0 Z0.03550
Recv: echo:  G29 W I1 J0 Z0.03350
Recv: echo:  G29 W I2 J0 Z0.05950
Recv: echo:  G29 W I3 J0 Z0.10050
Recv: echo:  G29 W I4 J0 Z0.14850
Recv: echo:  G29 W I0 J1 Z0.01550
Recv: echo:  G29 W I1 J1 Z0.02050
Recv: echo:  G29 W I2 J1 Z0.03950
Recv: echo:  G29 W I3 J1 Z0.05550
Recv: echo:  G29 W I4 J1 Z0.09850
Recv: echo:  G29 W I0 J2 Z0.00050
Recv: echo:  G29 W I1 J2 Z-0.00150
Recv: echo:  G29 W I2 J2 Z0.02850
Recv: echo:  G29 W I3 J2 Z0.03850
Recv: echo:  G29 W I4 J2 Z0.08850
Recv: echo:  G29 W I0 J3 Z0.02050
Recv: echo:  G29 W I1 J3 Z0.02350
Recv: echo:  G29 W I2 J3 Z0.06350
Recv: echo:  G29 W I3 J3 Z0.06950
Recv: echo:  G29 W I4 J3 Z0.11550
Recv: echo:  G29 W I0 J4 Z0.09550
Recv: echo:  G29 W I1 J4 Z0.07050
Recv: echo:  G29 W I2 J4 Z0.06450
Recv: echo:  G29 W I3 J4 Z0.05550
Recv: echo:  G29 W I4 J4 Z0.08350
Recv: echo:; Material heatup parameters:
Recv: echo:  M145 S0 H200 B60 F255
Recv: echo:  M145 S1 H240 B0 F255
Recv: echo:; PID settings:
Recv: echo:  M301 P24.68 I1.95 D78.17
Recv: echo:  M304 P92.17 I17.96 D315.29
Recv: echo:; Z-Probe Offset (mm):
Recv: echo:  M851 X-40.00 Y10.00 Z-2.78
Recv: echo:; Stepper driver current:
Recv: echo:  M906 X580 Y580 Z580
Recv: echo:  M906 T0 E650
Recv: 
Recv: echo:; Driver stepping mode:
Recv: echo:  M569 S1 X Y Z
Recv: echo:  M569 S1 T0 E
Recv: echo:; Linear Advance:
Recv: echo:  M900 K0.00
Recv: echo:; Filament load/unload lengths:
Recv: echo:  M603 L200.00 U200.00
Recv: ok