Strange :/
I managed to reproduce the bug on another computer equipped with Windows 10, but since there is no trace of this problem in the logs, it only remains to wait hoping that this bug is manifested more in future versions.
I added the current launcher_log.txt.
Well, but in this case, why when removing the fluid "water" of water.json, the fluid loses the characteristics of the water, but if I remove the fluid "lava" lava.json to put it in water.json, does not the lava take over the characteristics of the water? "lava" is nevertheless a valid fluid according to the F3.