What happens if a 3.3V supplied IC pull-up to a 5V with resistors?

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We had to make the PIC’s supply voltage 5V. Previously was 3.3V. SHT21 also works with 3.6V at most. We couldn’t change it.
Sht21 broken? Will i2c work correctly?
Note: There is no place to put an additional component such as level shifter and it’s the final product.
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