Can the tent explode in the sun for a long time?
No, because the main material for the tent is polyester, and for a long time, it must be aging.
If you have a full climbing cycle, you have been exposed to the mountains for more than a dozen days, and there may be no breakage on the outside, but it may not be a safe outfit for the next climb. The overall strength of nylon can vary greatly.
Tents themselves are consumables, alpine accounts are even more.