This excerpt from the user's manual can explain the problem of your mica sheet / waveguide cover.
"... Can be used to retain moisture, but should not come into contact with food. Carefully remove this sheet as steam may escape. Cannot remain airtight, so poke holes in it. Place the drip tray and pie tin on the black baking sheet in the oven and bake for 13 to 14 minutes.remove the rolls with a baking spatula as soon as the bottom is golden brown. The sausages can be replaced with chorizo, gruyère, goat's cheese, Roquefort cheese, etc...."
BLUESKY BMG254EL, BMG25400, BMG254035, BMG254070, BMG2540105, BMG2540140, BMG25-4EL, BMG25-4470, BMG25-44745, BMG25-44790, BMG25-447135, BMG25-447180
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 BMG25-4EL 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
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Here are examples for partial reference for microwave oven :
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