Bag of Words stores occurrences of 'hci' in corpus as 'hcus' in sparse data (or is lemmatizer to blame?)

[wvdvegte]

Describe the bug
For documents containing the string 'hci' (from human-computer interaction) in the corpus, Bag of Words changes 'hci' to 'hcus' in its sparse-matrix representation

To Reproduce
See attached workflow. Dataset is shared through Google Drive link

Expected behavior
"hci" should be kept as 'hci' in sparse data. Could this be some automatic conversion of latin plurals ending with '-i' to singular ending with '-us' (such as nuclei -> nucleus) caused by the lemmatizer?

Orange version:
3.36.2.

Text add-on version:
1.15.0
Screenshots
If applicable, add screenshots to help explain your problem.

Operating system:
Mac OS 14.3.1

Example workflow
hcus bug.ows.zip

[ajdapretnar]

Almost 100% certain it is the fault of the lemmatizer.