Steps to reproduce

1. Install/enable the first bundle, which provides an additional button in Online Editor, f.e. https://ezplatform.com/packages/contextualcode-ezplatform-content-variables. And check that the "Content Variables" button is injected into the OE.
2. Install/enabled the second bundle, which also provides an additional button in Online Editor, f.e. https://ezplatform.com/packages/contextualcode-ezplatform-alloyeditor-source. And check that the "Edit Source" button is injected into the OE.

Expected results

Both buttons ("Content Variables" and "Edit Source") are injected into the Online Editor.

Actual results

There is only the "Edit Source" button in the Online Editor. So if there are multiple bundles with custom online editor buttons, there will be shown only the ones from the bundle which was enabled last.