alvarolmedo opened a new issue, #19935: URL: https://github.com/apache/echarts/issues/19935
### Version last ### Link to Minimal Reproduction https://echarts.apache.org/examples/en/editor.html?code=G4QwTgBANglgzgFwEIgMYHsAmBTCBeAbQgHIkkAGSgRmIBoSzLyAmOhiygZjdI_IBYejSgFYhfAGzimAdmmUAHPPIBOeVXLqa9XtVY7hVbgY5VBJ6mIvkqU61Tn2l9tdeaa329pWb7vLY39mcyCrILsgxyDnINd_Tg94r11yTj8UzkCMkIywjIiMqIyYjLiU_kTy5OF-dJqsmpyavJqCmqKakpqy4RFK3uqOETqhhqGmoZahtqGOoa6hno4JfuXBygkRjbGNiY2pjZmNuY2FjaXKGVXL9fIZLbudu727g7uju5O7s7uL8gVrv9bgoHgongoXgo3goPgovgofgo_ipASpbioHionioXio3ioPioviofioLhoPABdABQoEgsEQAGUMGBsIQIDJ-PQEfRMvQuRAsfQJAp6GZ6DJRRypcwZNzOLyRLyBSp6CIZQKQWKqPydRAJKqIFCxeR6KaICIlRAqIaJAK-mrmMLzZwBRThQqLRI1ebmN6LcKrcbrVb-AKJHrhvz7f7XYr6HjeVKVgnPfcfbzzXD-WnDfx_ba5dbzTJ_cFhYabfynRBmFa0hKrcxPRphTWZFaRJW1Yby4K9e6IHyOTXfNy9QLh8wZcK9ZwrYnBUXOLGixVtdya0T-fQ-0jq7QaXToPBkCAAHYgAC2bKIxAAggAHR-wVAgBAwdDniCsjAwKDYJgPBPi-MBvh-X4QAAFtgYBgDA54AObAc-r7vp-35wBeQE6CBaEQd-ABm2Dnue2BQChoHgRhECPqyj5fjgYDoUhlH4TR17oGAH4AF7YGxYHoZBOBQQArleF4wHxAnUZBYnngA1rBCHIbhqGCQREAIGA6CiXAcDYCAokyUJ34IRg55wKeJGoAAniZmkAEbgOR9lqVRpkQHAACOomGQpMDYIgDk0QAsugUHXjeOEkHhGk0QBwAwAg77 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jR3Rwx0xyx2xxx1x7x_x4yIJ8J_gqJ3RxJ9UtJ3Jwp_xyRUd6p-p5pxJ4p7p_p4Z8Z6Z-Z2tWAFZ5zLZ_ZwtwQy5xhG55ZGbmlKD75_58WKawdwYrBKF2R-F_fFFyN5R_F2VxVxN_OQsSApl8QPVGAC-PxIT4h_l8DGC2T4TsT0l1C6z1Ts14jDV3VwF4191jz8wq1zMx1117181n1wN0N2yyN58-N4h1N067N_N5R0t7h5sYhxt8R5Vzt5y-8416icd_R4x8x6x-x5xzx3xwJxAEJ6b491py97J_J9p0p190xz91p_90Z4D0ZyZ77GZwd-DhDzZyQHZw5413D9MyQO50jzDwqaj1BAFxj951j2ADjzM2HJF_1LL7y4h-z-V5z6D2l0xKLyQNvH5Hn2N4zwfAVyz6D4X6T6D0L5FLz7V9HALy315G3yL5T21-LyAN12aCP81v14N6D6N1B73rF1Tqz8ryQKh3N0bAn1h--Dh1g9o1nut0R1t3r63wbxR6D8b7R6b2dxb5d9bzd3dw72J8969674p59yp57xp97zp77xGkDwH0H95yH--JD3D7Q8o-2CKZueAR4edkeB3JPin0a7p9M-JAbPhc2r48MiepXDntt26yl8JC_fGZjtBfj2wGeTnJnoV0wHw50BRfMga32q4d96urYbvsL1Kjl92unXIfpLx67j8UBJDYbnLypxRUXc9uIAA ### Steps to Reproduce 1.- Create a Heatmap using VisualMap. 2.- The Heatmap works correctly without categorization 3.- A categorization is added (lines 97-100 & 157,158 ) 4.- The gradiaton expected doesn't work: a list (for "Critical" category in the example) is passed and it doesn't work (black color in the background), a string is valid (for any other category in the example) (line 167) ### Current Behavior The gradiaton expected doesn't work: a list (for "Critical" category in the example) is passed and it doesn't work (black color in the background), a string is valid (for any other category in the example) (line 167) ### Expected Behavior The gradiation of heatmap works if a list of colors is passed. ### Environment ```markdown - OS: Linux - Browser: Chromium / Firefox - Framework: ``` ### Any additional comments? _No response_ -- This is an automated message from the Apache Git Service. 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