Setting TickFormatStops

[YVutov]

I'm trying to set TickFormatStops so zoom shows more sensible values. When I try to set it as:

_layout.XAxis[0].TickFormatStops = new List<TickFormatStop>
                                   {
                                       new TickFormatStop
                                       {
                                           DTickRange = { 0, 1000 },
                                           Value = "%H:%M:%S.%L ms",
                                       },
                                       new TickFormatStop
                                       {
                                           DTickRange = { 1000, 60000 },
                                           Value = "%H:%M:%S s",
                                       },
                                       new TickFormatStop
                                       {
                                           DTickRange = { 60000, 3600000 },
                                           Value = "%H:%M m",
                                       },
                                   };

I'm getting a NullReferenceException. This is on Blazor Server and called in OnInitialized(). Am I doing it wrong or is there a bug? The values are taken from:
https://plotly.com/python/tick-formatting/#tickformatstops-to-customize-for-different-zoom-levels

The layout is initialized prior.