I’ve just come across this issue myself.
I’ve been developing using 11.0.4 and LWJGL2 and it works. I upgraded to 11.0.5 and I get the error specified in the OP.
05 Jan 2020 10:47:07 [ WARN | javafx ] Loading FXML document with JavaFX API of version 11.0.1 by JavaFX runtime of version 11
05 Jan 2020 10:47:07 [ INFO | JmeSystem ] Running on jMonkeyEngine 3.3-alpha5
* Branch: HEAD
* Git Hash: bb32b88
* Build Date: 2019-09-21
Inconsistency detected by ld.so: dl-lookup.c: 111: check_match: Assertion `version->filename == NULL || ! _dl_name_match_p (version->filename, map)' failed!
using LWJGL3 gets rid of this error.
So it appears to be some kind of issue with LWJGL2 and Java 11.0.5 and above, since 11.0.4 works.