We have tested the Webwork-2.18 (Docker Instance) with LTI 1.3 and D2L recently and have been successful. If you are also using Brightspace and would like the convenience of seamless integration between Brightspace and WeBWorK that offers automatic login and grade transfer, then the newly revamped WeBWorK LTI 1.3 interface will help. The tutorial (https://sukhjitsehra.github.io/webwork-2.18/) will assist in configuring WeBWorK and D2L so that LTI 1.3 can be utilized.
WeBWorK Main Forum
WeBWorK LTI 1.3 Integration with Brightspace (D2L)
This forum has a limit to the number of forum postings you can make in a given time period - this is currently set at 10 posting(s) in 1 day