I would at least temporarily cover that liner with something to protect it from sun, until a decision is made on what to do for the permanent solution. Might be best in the long run to make a small dam on the low side and raise it a foot.
This liner material is pretty resilient to the sun. It is not the normal liner. It is about like the plastic that a 3 ring rider is made out of. They use in the oil fields for frac ponds and it stays exposed on them all the time. There is a big frac pond I have been driving by at work for about 5 years and I stop and look at the liner from time to time and it looks the same as it did 5 years ago.
I had an oilfield company install it. They do them all the time and did a good job I think but they are not normally concerned with the cosmetic aspect of it.
Regardless I plan on getting it fixed or covered somehow within the next couple weeks.
