If you search for "Is LaMDA sentient", you'll get plenty of articles like https://opendatascience.com/is-lamda-really-sentient-no-far-from-it/ and https://link.springer.com/article/10.1007/s00146-022-01559-z talking about it not being sentient. From the latter:
So, where is the sentience? Well, nowhere, it seems. LaMDA does not have any. It does not experience, it does not feel, and it does not have memories. If you ask LaMDA, "are you happy?" it will generate an answer based on what it has been trained to optimise: language use. It is not going to recall a time when it was happy or sad—that winter where it was lonely because the other servers were ignoring it, or that time the training function was upset because it was not being called enough. We can call this loneliness, but in so doing, we rob loneliness of its meaning.
So, it should be clear that LaMDA is not sentient. Anyone who claims it does has a significant burden of proof to bear.
Also good is https://ai.stackexchange.com/a/36252, which mentions how Lemoine is likely falling victim to the ELIZA effect.
It's also worth noting that if LaMDA were indeed sentient (or there was still a possibility it could be considered as such), we could expect to see some continuing discussion about it. Instead, in the above search I did not see any results from 2023. This is absolutely not solid evidence that LaMDA is not sentient, but it is worth noting.