The libraries have always loaded each time a new file is opened in all versions of AC, even 11. It is the PLN file itself that says what libraries to load, and where they are...
Sounds like a network problem - however over WAN/VPN you should be loading local copies of the standard libraries (assuming you are not teamworked) - not from the remote server.
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AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB