In one gaming session, each Wonder may only be built once (Wonder refers to Improvements with the AllowedPerGame=1 tag).
EreogsTower | GreatMill | HostensLibrary | IronWorks | MerchantcrossBazaar | TreasuryVault
This creates two problems:
1. If you or the AI built a Wonder in game #1, you will not be able to build said Wonder in game #2 unless you first exit LH and restart it. The AI can still build it whether or not you restart.
2. If you destroy a Wonder without destroying the City it is in or if you Raze a City with a Wonder in it, you will not be able to rebuild it in your current game unless you first exit LH and restart it. The AI can still (re)build it whether or not you restart.
First reported here.
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LH Mods by Primal
XtraDeconstruct
XtraDeconstruct Canons