https://www.holy-bhagavad-gita.org/chapter/9/verse/23
येऽप्यन्यदेवता भक्ता यजन्ते श्रद्धयान्विता: | तेऽपि मामेव कौन्तेय यजन्त्यविधिपूर्वकम् || 23||
BG 9.23: O son of Kunti, even those devotees who faithfully worship other gods also worship Me. But they do so by the wrong method.
There is also the "Akashat patitam toyam" verse
आकाशात् पतितं तोयं यथा गच्छति सागरम् । सर्वदेवनमस्कारं केशवं प्रतिगच्छति ॥
ākāśāt patitaṃ toyaṃ yathā gacchati sāgaram । sarvadevanamaskāraṃ keśavaṃ pratigacchati ॥
Meaning:
As the water that falls down in rain from anywhere in the sky finally reaches the Ocean, the worship of any divine aspect ultimately reaches the Supreme Being.
These seem to be contradicted by
यान्ति देवव्रता देवान्पितॄ न्यान्ति पितृव्रता: | भूतानि यान्ति भूतेज्या यान्ति मद्याजिनोऽपि माम् ||25||
BG 9.25: Worshippers of the celestial gods take birth amongst the celestial gods, worshippers of the ancestors go to the ancestors, worshippers of ghosts take birth amongst such beings, and My devotees come to Me alone.
How can an worshiper NOT worship Krishna?
EDIT: Related, but not duplicate
Does Krishna say in the Bhagavad Gita that he alone can grant liberation?