[Tronxy X5SA PRO problem - Cura5.3.0 generates G-code without nozzle and bed preheating.]

That's apparently how I figured it out.
I removed the comments in the highlighted lines in bold (the text after the semicolon).
See above.
A functional startup script is like this:

; X5SA Start Code
G21; Set units to millimeters
G90; Set all axis to Absolute
M82
;
; Uncomment the line below to enable ABL Mesh probing
;G29 ; Probe bed mesh for ABL
; For best results do not run nozzle heater while performing ABL
M107 T0; Disable all fans
M140 S{material_bed_temperature_layer_0}
M104 S{material_print_temperature_layer_0} T0

M190 S{material_bed_temperature_layer_0}

M109 S{material_print_temperature_layer_0} T0

G28; Home all axis
G1 Z15.0 F6000; Raise nozzle to prevent scratching of heat bed
G1 X0 Y0 ; Move nozzle to Home before heating
G0 E3 F200
G92 E0 ; Set Extruder position to zero
; Uncomment the following lines to enable nozzle purge line along left edge of bed
;G1 Z2.0 F3000 ; Raise Z axis
;G1 X1.1 Y20 Z0.2 F3600.0 ; Move to purge line start position
;G1 Y220 F1500.0 E10 ; Draw first purge line
;G1 X1.4 F3600.0 ; Move to the side
;G1 Y20 F1500.0 E20 ; Draw second purge line
;G92 E0 ; Reset Extruder
;G1 Z2.0 F3000 ; Move Z Axis up a little to prevent scratching of Heat Bed
;G1 X5 Y20 Z0.2 F3600.0 ; Move over to finish nozzle wipe
;G92 E0

[Tronxy X5SA PRO problem - Cura5.3.0 generates G-code without nozzle and bed preheating.]

I also found out the following
The supplied test print model contains this gcode sequence:
  M82 ;absolute extrusion mode
G21
G90
M82
M107 T0
M140 S40
M104 S200 T0
M190 S40
M109 S200 T0

 

This sequence reliably heats the nozzle and the bed and waits for printing until the correct temperature is reached

 

I also adjusted the startup sequence for my printer accordingly:
; X5SA Start Code
G21; Set units to millimeters
G90; Set all axis to Absolute
M82
;
; Uncomment the line below to enable ABL Mesh probing
;G29 ; Probe bed mesh for ABL
; For best results do not run nozzle heater while performing ABL
M107 T0; Disable all fans
M140 S{material_bed_temperature_layer_0} ; Set bed temperature
M104 S{material_print_temperature_layer_0} T0 ; Set nozzle temp
M190 S{material_bed_temperature_layer_0} ; Set bed temperature and wait
M109 S{material_print_temperature_layer_0} T0 ; Set nozzle temperature and wait
G28; Home all axis
G1 Z15.0 F6000; Raise nozzle to prevent scratching of heat bed
G1 X0 Y0 ; Move nozzle to Home before heating
G0 E3 F200
G92 E0 ; Set Extruder position to zero
; Uncomment the following lines to enable nozzle purge line along left edge of bed
;G1 Z2.0 F3000 ; Raise Z axis
;G1 X1.1 Y20 Z0.2 F3600.0 ; Move to purge line start position
;G1 Y220 F1500.0 E10 ; Draw first purge line
;G1 X1.4 F3600.0 ; Move to the side
;G1 Y20 F1500.0 E20 ; Draw second purge line
;G92 E0 ; Reset Extruder
;G1 Z2.0 F3000 ; Move Z Axis up a little to prevent scratching of Heat Bed
;G1 X5 Y20 Z0.2 F3600.0 ; Move over to finish nozzle wipe
;G92 E0
 

Despite the fact that slicing adds this sequence to the gcode, neither the bed nor the nozzle will start heating up immediately, and the printing will start - the print head will start moving.

On the printer display, you can see that the temperature is switched on immediately after starting the print.
If I overwrite the opening sequence with the opening sequence in the generated file, then heating starts immediately and printing waits until the desired temperature is reached.

There is generate gcode from Cura:
;FLAVOR:Marlin
;TIME:1646
;Filament used: 1.37576m
;Layer height: 0.15
;MINX:144
;MINY:144
;MINZ:0.2
;MAXX:186
;MAXY:186
;MAXZ:19.96
;Generated with Cura_SteamEngine 5.3.0
M82 ;absolute extrusion mode
; X5SA Start Code
G21 ; Set units to millimeters
G90 ; Set all axis to Absolute
M82
;
; Uncomment the line below to enable ABL Mesh probing
;G29 ; Probe bed mesh for ABL
; For best results do not run nozzle heater while performing ABL
M107 T0; Disable all fans
M140 S40 ; Set bed temperature
M104 S200 T0 ; Set nozzle temp 
M190 S40 ; Set bed temperature and wait
M109 S200 T0 ; Set nozzle temp and wait
G28 ; Home all axis

Unfortunately, I cannot explain why the Printer does not accept this generated code.

[Tronxy X5SA PRO problem - Cura5.3.0 generates G-code without nozzle and bed preheating.]

I bought a Tronxy X5SA PRO and I have a problem - the Ultimaker Cura5.3.0 software generates G-code without preheating the nozzle and bed.
Maybe I have the printer set up correctly.
What am I doing wrong?