tickmode array combined with tickson='boundaries' returns error for categorical axis

[stephprobst]

I'm plotting offline.

Reproducible example:

import plotly.graph_objects as go

fig = go.Figure(go.Bar(
    x = ['A', 'B', 'C', 'D', 'E'],
    y = [28.8, 28.5, 37, 56.8, 69.7]
))


fig.update_layout(
    xaxis = dict(
        tickmode = 'array',
        tickvals = ['1', '3', '5'],
        ticktext = ['One', 'Three', 'Five'],
        tickson = 'boundaries'
    )
)

fig.full_figure_for_development()

Error:

ValueError: Transform failed with error code 525: Cannot read property '0' of undefined

Additional information:

• Plotly version: 4.14.1
• The issue only appears for categorical axis. Removing either the ticktext property or the tickson property removes the error.

[archmoj]

I was not able to replicate this using plotly.js in this codepen.

[stephprobst]

I can confirm, that the issue went away since I reported it for plotly.py 4.14.1. I just tested it with plotly.py 5.2.1 and it works fine.