This excerpt from the user's manual can explain the problem of your mica sheet / waveguide cover.
"...For maintenance and repair of the oven, contact the nearest authorized dealer. If you do not keep the oven clean, it may be possible to reduce the quality of the surfaces, which will shorten the life of the appliance and possibly create dangerous situations. Blocking the ventilation openings can lead to overheating and interfere with the operation of the oven. Leave this with the combination 1 to 480 W. Preparation method Cut the potatoes after peeling and washing them into thin slices and season them. Grease the refractory bowl, place the potato slices in layers and pour the whipped cream over them...."
BLUESKY BMG204S, BMG20MD9, BMG208, BMG 20
Manufacturer's part price is £10.91 Discount for bulk (starting at 10 units), £10.55 per unit
This manufacturer part is recomended by BLUESKY, which gives it a 10/10 rating.
This spare part is recommended for your BLUESKY BMG 20 microwave oven .
All spare parts are new and come with a 1 year warranty
① Carefully check your BLUESKY microwave oven's product number
② Start search
** Free returns and exhanches : satisfied or your money back for 30 days Do you want to know more?
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Here are examples for partial reference for microwave oven :
Where to find the reference?