It is narrated from Sayyidah Umm Hani (may Allah be pleased with her) that she disliked performing ablution with water in which pieces of bread are floating.
If this narration is authentic, then she meant only when the bread dominates the water so that it is attributed entirely to the bread, that is, it no longer remains water.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 21