Incorrect rendering of Layer 2 in Combined Chart after update to v2.9.0

[MegajeansIT]

After updating DataLens OpenSource to v2.9.0 (2026-02-18) we noticed an issue with Layer 2 rendering in a Combo Chart.

Description

We use a combo chart with two layers:

• Layer 1 — bars (impressions, clicks, add-to-cart, orders)
• Layer 2 — lines with conversion metrics displayed on Y2 axis (CTR, CR1, CR2, CR2/2)

Expected behavior

Layer 2 metrics should be displayed as lines scaled to the secondary Y2 axis, as in previous versions.

Actual behavior

Layer 2 lines are rendered incorrectly — they appear close to the zero line and are almost invisible, although value labels are displayed.

Notes

• Dataset and chart configuration are identical.
• The issue appeared after upgrading to v2.9.0.
• Light theme screenshot — DataLens OpenSource
• Dark theme screenshot — DataLens Cloud
• The charts and settings are the same.

Metrics in Layer 2

• CTR
• CR1
• CR2
• CR2/2

Screenshots