This excerpt from the user's manual can explain the problem of your mica sheet / waveguide cover.
"... Cottage cheese) looks good, but it is soggy inside. The dough cannot be removed from the pan. You have measured the oven temperature with your own thermometer and found a deviation. FISH OR MEAT AND FISH STOCKS Since the outside of this type of food thaws quickly, they must be separated; break the block into regular pieces during thawing and remove the pieces that have already been thawed. SMALL PORTIONS Chops and chicken pieces should be separated as quickly as possible so that they thaw evenly and completely. Greasy parts and ends thaw more quickly...."
BLUESKY BMG254EL, BMG258EL, BMG25E, BMG 25 4 EL, BMG 25 E
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 25 4 EL microwave oven .
All spare parts are new and come with a 1 year warranty
① Carefully check your BLUESKY microwave oven's product number
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Here are examples for partial reference for microwave oven :
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