newick_utils won't read tree successfully if tip labels containing hybrid symbol "x"

[Cactusolo]

The issue is really simple as title:

Example:
(base) [cactus@fe1 Malvales]$ nw_display Malvales.newick.tre
ERROR: missing ')' at line 0 near '_conradiae'
×(base) [cactus@fe1 Malvales]$ nw_labels -I Malvales.newick.tre
ERROR: missing ')' at line 0 near '_conradiae'
×(base) [cactus@fe1 Malvales]$ nano Malvales.newick.tre

GNU nano 2.3.1 File: Malvales.newick.tre

...tefossei:0.4961239736729732,(Thymelaea_×_conradiae:0.3296726924435291,(Thymelaea_procumbens:0.0708429140197281...