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AutoMergingRetriever treats __level=0 / __block_size=0 as missing metadata

Status: Open.

#12634 In deepset-ai/haystack;

· coder058 opened on Sep 6, 2026

OutputAdapter silently coerces string output to another type when output_type is a Union including str.

Status: Open.

#12625 In deepset-ai/haystack;

· Anishithavaram-4242 opened on Sep 5, 2026

FileTypeRouter and DocumentTypeRouter also raise unhelpful TypeError for reserved output names (sibling of #12614)

Status: Open.

#12622 In deepset-ai/haystack;

· Harsh23Kashyap opened on Sep 5, 2026

Agent tool scheduler picks write-write winner by batch order, not call order, contradicting its own docstring and #11690

Status: Open.

#12621 In deepset-ai/haystack;

· AmirF194 opened on Sep 5, 2026

MarkdownHeaderSplitter page_number exceeds the real page count when split_overlap is used

Status: Open.

#12618 In deepset-ai/haystack;

· Vedant-Agarwal opened on Sep 5, 2026

ConditionalRouter silently coerces string output to another type when output_type is str | None

Status: Open.

#12617 In deepset-ai/haystack;

· Anishithavaram-4242 opened on Sep 5, 2026

MetadataRouter raises an unhelpful TypeError for the reserved 'unmatched' rule name

Status: Open.

#12614 In deepset-ai/haystack;

· junnhwan opened on Sep 5, 2026

OpenAIChatGenerator streaming raises ValueError when a delta has both content and a tool call

Status: Open.

#12610 In deepset-ai/haystack;

· AmirF194 opened on Sep 4, 2026

ChatMessage.from_openai_dict_format silently collapses OpenAI's 'developer' role into 'system'

Status: Open.

#12604 In deepset-ai/haystack;

· Harsh23Kashyap opened on Sep 4, 2026

[HTTPXodus] Consider migrating from httpx to httpx2 (the actively maintained fork)

P3Low priority, leave it in the backlogLow priority, leave it in the backlog

Status: Open.

Task

#12593 In deepset-ai/haystack;

· ProgrammerPlus1998 opened on Sep 4, 2026

4 of 5 Document*Evaluators crash with ZeroDivisionError on empty input

P3Low priority, leave it in the backlogLow priority, leave it in the backlog

Status: Open.

Bug

#12543 In deepset-ai/haystack;

· Harsh23Kashyap opened on Sep 1, 2026

CacheChecker.run issues one filter_documents call per item (N+1 query pattern)

Status: Open.

#12535 In deepset-ai/haystack;

· Harsh23Kashyap opened on Aug 31, 2026