As you probably know, the contact angle depends on the surface energies between all components involved as described by the Young equation (or its augmented descendants).

If you change the solvent, you will get different surface energies and therefore a different contact angle. If you wanted to do this as a benchmark to verify the reproducibility of your crystal quality, that would be perfectly fine, but if you want to use to measure the surface energy between perovskite and water, that wouldn't work and since you asked specifically about hydrophobicity, this is probably the case you have here.