[Bug]: rearrange_cache silently skips FP32 KV cache copy due to duplicate size == 2 condition

[KarSri7694]

OpenVINO Version

2026.0.0

Operating System

Windows 11

Device used for inference

GPU

Framework

None

Model used

No response

Issue description

In multi_tensor_variable_state.cpp in intel_gpu plugin, the rearrange_cache function contains a duplicate condition that causes FP32 KV cache data to never be copied, silently producing garbage output.

Buggy code:

if (ov::element::Type(kv_layout.data_type).size() == 2)
    copy_element<uint16_t>(...);
else if (ov::element::Type(kv_layout.data_type).size() == 2)  // ← duplicate, never true
    copy_element<uint32_t>(...);

Expected: Second condition should be == 4 to handle 4-byte data like fp32 or int32

Impact: When running beam search on GPU with FP32 precision and calling get_state(), the output buffer is never written and contains uninitialized memory. This causes silently corrupted results with no error or warning.

Fix:

if (ov::element::Type(kv_layout.data_type).size() == 2)
    copy_element<uint16_t>(...);
else if (ov::element::Type(kv_layout.data_type).size() == 4)
    copy_element<uint32_t>(...);

If requested I can open a related PR.

Step-by-step reproduction

No response

Relevant log output

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