Hi.
So for each completed altar you will heal a tree in town and get additional 40 points to your town rank. In order:
Town sacred tree healed - Crop Altar
Forest sacred tree healed - Catch Altar
Lake sacred tree healed - Advanced Altar
Farm sacred tree healed - Rare Altar
According to your log, the last finished healed altar in the 1st, but you also mention that you healed third altar first. So the dialogue for healing the lake tree is technically correct.
So regarding the dialogue about healing only lake tree, there 2 options:
Have you slept? If you didn't, see what the townies say the next day.
If you did and dialogue is still the same - please report here https://discord.com/channels/623097219628662784/1265082156619661413
Regarding the additional points:
If you did this recently, I would advise you to check you log or temporarily go to the backup (how to - https://discord.com/channels/623097219628662784/1273006437517365350) and check the log.
If a lot of time passed and you're still sure. Please make a report to https://discord.com/channels/623097219628662784/1222876094190059542
With screenshots of your current log, museum progress, and ocean map. If you're on steam also your save and backups.
Regarding further progress:
Don't worry, you're not going to be locked out. Keep donating to the museum. And since you're waiting a bit on the Catch Altar, try to focus on others and completing collections in the museum. This will give additional 40 points for each collection. Cave of Memories is now open to you and will help in artifacts, fossils and geodes.