Loading only specific icons using icon_names parameter does not work properly when using the table icon

[Warwizza]

I'm trying to limit the loaded icons by adding the ones I'm using to the icon_names parameter in the URL as shown in the examples in the docs.
This does not work properly when I add the 'table' icon. The table icon and the one that comes after that are both not displayed.
See this CodePen as an example,

Reproduction steps:

1. Open the CodePen above. You will see the timer and visibility icon are displayed but table and timeline are not
2. When you remove the table from the icon_names parameter the timeline icon will also display
3. When you add table back and remove timeline, the timer icon will no longer be displayed
4. When you comment the first link element and uncomment the one below (which will load all icons) all 4 icons will show up

[stones]

I have a similar, though slightly different issue where if I add 'thumb_up', 'timeline' or 'trending_up' to my icon_names, 'star' stops working.

Adding 'volcano' isn't an issue

[hlev]

Same here for the &icon_names=airport_shuttle,directions_car,travel
Only travel is delivered in the font pack, neither of the ones with an underscore in the name