Y-axis labels incorrectly truncate to last 5 digits, losing sign and leading digits

[Mary-Gu]

Bug Report

When using Plot on the web platform built from Docker, the Y-axis labels truncate numeric values to only the last 5 digits, discarding leading digits and even the minus sign.

Example Code

Plot[10*Cos[x]*x^4, {x, -10, 10}]
Plot[20*Cos[x]*x^4, {x, -10, 10}]

this is not limited to these functions — any Plot[f(x), {x, a, b}] with sufficiently large values (both positive and negative) will reproduce the problem. These two are just examples.

Screenshots

Observed Behavior

The Y-axis values only show the last 5 digits.

For example:
-30,000 appears as 30,000 (sign and 3 lost)
-1200,000 appears as 00,000 (only the 5 digits from the right remained)

The negative sign is entirely missing in the label, which can lead to misinterpretation of the graph.
This seems to be due to a digit-limiting logic that incorrectly applies a "last 5 digits" filter.

Expected Behavior

The entire number should be displayed, including the negative sign and leading digits.
If truncation is desired for formatting, it should be applied carefully, e.g., with scientific notation or by preserving sign and significant figures.

Possible Cause

This might be caused by a formatting function that tries to "preserve 5 digits" but incorrectly slices from the right end of the number string, instead of formatting it meaningfully.

[JerryI]

This is a bit tricky to fix from frontend side, since the canvas and padding are fixed by Wolfram Kernel. However, what I can suggest as a temporal solution is

Plot[20 Cos[x] (*SpB[*)Power[x(*|*),(*|*)4](*]SpB*), {x, -10, 10}, ImagePadding->50]

just copy and paste

[Mary-Gu]

Thanks a lot for the suggestion! That makes sense.