It looks like the current version of Discussion Tools causes TemplateStyles not to load properly in certain cases.
E.g. the welcome message Template:Hola on nl.wp uses TemplateStyles;
- on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, the welcome message looks fine [1]
- on 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, the message looks fine when Discussion Tools is disabled, but it lacks styling when it is enabled [2]
The pages 16–45 contain an empty <style data-mw-deduplicate="TemplateStyles:r56789563"></style> when Discussion Tools is enabled.
[1] The welcome message as it should look (:c):
[2] The welcome message without the TemplateStyles styling (:c):
