The fees in NFTXVaultUpgradeable can be set arbitrarily high (no restriction in setFees).
The manager can front-run mints and set a huge fee (for example fee = base) which transfers users NFTs to the vault but doesnt mint any pool share tokens in return for the user.
Similar griefing attacks are also possible with other functions besides mint.
Recommend checking for a max fee as a percentage of base (like 10%) whenever setting fees.
